on the show Futurama, Leela, Amy, Kip and Zapp Brannigan get stuck on the Amazonian Planet where sex is referred to as snusnu and is actually a way of torturing men who trespass.

Femputer: The Amazonians will be divided into three groups. The one called Zapp will be snu-snued by the large women. He who is designated Fry will be snu-snued by the petite women. And Kif, being the most attractive male, will be snu-snued by the most attractive women of Amazonia. Then the large women! Then the petite women! Then the large women again!

Endless sex forced on a man by a variety of women usually resulting in the death of the man. From Futurama episode in which the main characters are condemned to "Death by Snu-snu!" by a alien matriarchal society, ignorant of the earthling male's view of this as a most fitting death.

-"W-what happened to these people?" he asked looking at skeleton's with crushed pelvis bones.
--"They were condemned to die by snu-snu!"
-"YAY! Snu-snu!!"

NOUN:
a common form of punishment performed by future amazonian women. The word "snu snu" is technically translated as "sex", which may seem as an extremely convenient disciplinary technique for condemned men, however the punishment "advisers" are always very large women usually resulting in crushed pelvises. The punishment is pleasurable yet devastating to men, ending in a series of excited to frightened facial expressions shortly after they are condemned.

This act's resources were found from the Futurama episode "Amazonian women in the mood". This is the first episode of season 3.

FemPuter: YOU ARE NOW CONDEMNED TO DEATH BY SNU SNU!
Prisoners: :D......:0......:)....:0.....:D....:0

Originally butt rape, though currently sex with big women (either fat or muscular).

The original use for death by snu snu was suffering from a worse version of the option you tried to avoid.

Originally it came from the joke that went something like this:

Two men were trapped on an island of savages. The chief gives them a choice. You may undergo "snu snu" or you may die. The first man chooses snu snu. A large savage takes him and rapes him violently. Afterwards, the man is free to go. The second man decides he'll take death. The chief smiles and yells out "death by snu snu!"